Exhibit 99.1 ALLEGIANT TRAVEL COMPANY FIRST QUARTER 2026 FINANCIAL RESULTS First quarter 2026 GAAP diluted earnings per share of $2.30 First quarter 2026 adjusted diluted earnings per share of $3.77 , up 78.7 percent year-over-year (1)(2) LAS VEGAS. April 30, 2026 — Allegiant Travel Company (NASDAQ: ALGT) today reported the below financial results for first quarter 2026, as well as comparisons to the prior year. "We had a great start to the year, delivering another quarter of strong operational and financia ...